Attachment for threshing machines



F. HECKMAN ErAL ATTACHMENT FOR THRESHING MACHINES Dec. 15, 1942.

Filed Aug. 4, 1941 Qcfi 156903772472 m waymlik;

ATTORNEYS Patented Dec. 15, 1942 Frank Heckman aiid Jack Heckman,Bisbee,

N. Dak.

Application August 4, 1941, Serial No. 405,402

1 Claim.

The present invention relates to an attachment for threshingv machinesprimarily designed for removing foreign substances such as stones, partsof machinery and the like from the grain being fed through the machine.

The primary object of the invention is to provide a plate yieldably heldinfront of the concave of a thresher which, when contacted by relativelyheavy articles such as stones, will drop out of alignment with theconcave so as to deposit such articles beneath the machine therebypreventing damage to the concave and cylinder mounted thereabove.

Another object of the invention is to provide a plate having the abovecharacteristics that is readily adjustable from the exterior of themachine so as to adapt the plate for various weights of grain being fedto the cylinder and'concave.

The invention also consists in certain other features of constructionand in the combination and arrangement of the several parts, to behereinafter fully described, illustrated in the accompanying drawing andspecifically pointed out in the appended claim.

In describing our invention in detail, reference will be had to theaccompanying drawing wherein like characters denote like orcorresponding parts throughout the several views, and

in which:

Figure 1 is a view in vertical section of a portion of a threshingmachine showing the attachment applied thereto.

Figure 2 is a vertical sectional view taken substantially on line 2--2of Figure 1.

Figure 3 is an enlarged fragmentary sectional v for agitating andbeating the grain whereby the loose particles of grain'will be forceddownwardly through the concave 8. A carrier 9 is provided beneath theconcave which receives the grain from the concave and deposits the samein suitable receptacles, not shown. The parts just described form nopart of the present invention.

. Quite frequently in the feeding of the material to the cylinder 6,stones and the like will be ac- In such cases,

cidentally included in the mass. the straw passing through at the sametime will are of conventional construction and not be perfectlythreshed, and injury is likely to result to the concave or to thethreshing cylinder. In accordance with the present invention, a plate I0having its upper face flush with the upper face of the concave, ismounted in front.

of the threshing cylinder 6 and extends entirely across the cylinder.The rear edge of the plate I0 is formed with a square-shaped opening forreceiving the shaft II, which shaft is substantially square-shaped incross section and forms the means of pivotally supporting the plate III.The ends of the shaft I I are reduced in diameter and extend throughopenings I2 formed in the side walls I3 of the threshing machine. L-shaped brackets I4 are secured by bolts or similar means I5 to the outerface of the walls I3 and support bearing plates I6 in which the ends ofthe shaft I I are disposed. An arm I! is attached to each end of theshaft II adapted to control movement of the plate III as willhereinafter appear. The normal position of the plate I0 and arms I! isshown in Figure 1 of the drawing where it will be noted that the upperface of the plate It is substantially in line with the upper face of theconcave 8. The arm I'I moves toward the cylinder I5 upon contact of aheavy article with the plate I0 against the tension of the spring I8.The return movement of the arm I1 is limitedby means of the stop platesI9 which are attached to and extend from the walls I3. When the arms I!are in contact with the plates I9, the plate I 0 will always be inalignment with the concave 8.

The tension springs I8 have one end attached to the arms IT as indicatedat 2 0 with their other ends attachedtoan eye bolt 22 as indicated at 2I, said bolt extending through a bracket 23 and supporting on the outerend thereof wing nuts 24. Tightening or loosening the wing nuts 24 willincrease or decrease the tension of the springs I8. It will be notedthat the brackets 23, plates I9 and L-shaped brackets I4 are allattached on the outer face of the walls I3 so as to be readilyaccessible for adjustment.

When astone or similar heavy article leaves the grain carrier 5 andcomes in contact with the plate I0, the teeth of the cylinder 6 willstrike the article to drive the plate II] downwardly against the tensionof the springs I8 in the manner shown in Figure 3 of the drawing. Afterthe article has passed through the opening, the tension of the springsI8 will return the plate I0 to its normal position, movement of the armI! in a rearward direction being limited by the plates I9. The openingand closing of the plate I0 is substantially instantaneous therebyprecluding the possibility of any appreciable quantity of straw beingdischarged through the opening formed by the plate In with the stone.After passing through the opening, the stone will be deposited onto thegrain pan carrier 9 for discharge from the machine.

Also it will be understood, of course, by those skilled in the art thatvariations in the hereinabove described device involving thesubstitution of substantial equivalents for the devices described areintended to be comprehended within the spirit of the present inventionand that the invention is capable of extended application and is notconfined to the exact showing of the drawing nor to the preciseconstruction described and, therefore, such changes and modificationsmay be made therein as do not affect the spirit of the invention norexceed the scope thereof as expressed in the appended claim.

What is claimed is:

In a threshing machine having a horizontal rotary thrashing cylindermounted thereon, a concave spaced from the lower portion of thecylinder, a feed conveyor supported on the ma.- china and having itsdischarge end. disposed above and spaced horizontally from the front'end of the concave, a horizontal pivot shaft mounted below thedischarge end of the conveyor parallel with and spaced from the frontend of the concave, a plate fixed to the said shaft and disposed tonormally extend between the shaft and the front end of the concavecoextensive with the concave, an arm fixed to and extending radiallyfrom the shaft, a tension spring having one end fastened to the outerend .of the arm, a bolt attached to the opposite end of the spring andextending through an opening in a guide bracket secured on the machine,and a nut threadedly engaging the said bolt and bearing against theouter side of the bracket for adjusting the tension of the spring.

FRANK HECKMAN. JACK HECKMAN.

